首采煤层顶底板围岩裂隙内瓦斯储集及卸压瓦斯抽采技术研究

低透性松软高瓦斯煤层群首采层开采过程中，顶低板岩层冒落、移动，产生裂隙，开采煤层和邻近卸压煤层内的瓦斯将大量卸压、解吸，卸压瓦斯沿裂隙通道汇集到环形裂隙圈内，形成瓦斯积存库。本文将论述环形裂隙圈位置的确定方法，分析裂隙圈内瓦斯积存的过程，介绍将抽采钻孔和巷道布置在首采层的顶板环形裂隙圈内进行瓦斯抽采的技术和效果。

Study on Gas Extracting Technology of Gas Destressing and Gas Storage from Fractures in Surrounding Rock of Roof and Floor of the First-mined Seams

In the process of first mining in soft high gassy seam groups with low permeability, fractures as well as big destressing and absorption of gas in working seams and adjacent relief seams occur with the collapse and movement of the strata of roof and floor. Destressing gas from large areas converges at the well-developed zones with fractures along the fracturing channel, which is within the O fracturing ring, forming the gas accumulating reservoir in the ring. The paper has discussed the method of locating the O ring, analyzed the process of gas accumulation in the ring and introduced arranging bereholes and tunnels in the O ring of the roof of the firstmined seams in order to employ the efficient gas extracting technology with better results.